Material inter-recycling for advanced nitrogen and residual COD removal from bio-treated coking wastewater through autotrophic denitrification

Jingde Ma; Haizhen Wu; Yixian Wang; Guanglei Qiu; Bingbing Fu; Chaofei Wu; Chaohai Wei

doi:10.1016/j.biortech.2019.121616

Material inter-recycling for advanced nitrogen and residual COD removal from bio-treated coking wastewater through autotrophic denitrification

Bioresour Technol. 2019 Oct:289:121616. doi: 10.1016/j.biortech.2019.121616. Epub 2019 Jun 7.

Authors

Jingde Ma¹, Haizhen Wu², Yixian Wang³, Guanglei Qiu³, Bingbing Fu³, Chaofei Wu³, Chaohai Wei⁴

Affiliations

¹ School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, PR China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
² School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, PR China. Electronic address: hzhwu2@scut.edu.cn.
³ School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
⁴ School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China. Electronic address: cechwei@scut.edu.cn.

PMID: 31226671
DOI: 10.1016/j.biortech.2019.121616

Abstract

For wastewaters containing high strength sulfide and nitrogen (e.g. coking wastewater), sulfide might be precipitated and recovered using ferrous salt. This study systematically investigated the feasibility of recovered and precipitated FeS (comparing to commercial FeS minerals) to support autotrophic denitrification for advance nitrogen removal from bio-treated coking wastewater in fluidized bed reactors. The reactor with precipitated FeS could achieve simultaneous removal of NO₃^--N and inert COD with high efficiencies of around 96.3% and 30.5%, at NO₃^--N and COD loading rates of 4.18 mg·L^-1·h^-1 and 8.06 mg·L^-1·h^-1, respectively. Whereas, the performance of commercial FeS reduced gradually and irreversibly after two days, which became completely ineffective after 40 days. Thiobacillus and Rhodanobacter dominated the biomass, which played a key role in the FeS-based denitrification process. This material inter-recycling concept benefits an advance and more sustainable treatment of wastewaters with high strength sulfide and nitrogen.

Keywords: Autotrophic denitrification; COD removal; Iron sulfide; Material inter-recycling; Nitrate removal.

MeSH terms

Autotrophic Processes
Bioreactors
Coke*
Denitrification*
Nitrates
Nitrogen
Waste Disposal, Fluid
Wastewater

Substances

Coke
Nitrates
Waste Water
Nitrogen